You can’t exactly call Lottie Moggach’s debut, Kiss Me First, a high-tech thriller. The mousy protagonist, Leila, isn’t the hacker Lisbeth Salander is — she does most of her damage via Facebook and email. But it’s the story’s everyday believability that makes Kiss Me First so chilling. Leila, who’s recently lost her only friend — her mother — is thrilled when a charismatic Web guru taps her to carry out an odd task: becoming the online presence of Tess, an alluring, disturbed real woman who wants to kill herself without her friends and family knowing. As Leila becomes more and more fixated on her Internet persona, Moggach sucks us into the rabbit hole of her dangerous obsession with deftly timed twists and memorable characters. A-